Method of correcting printing presses



Dec. 1924. 1,518,562

L. W. C-LAYBOURN METHOD OF CORRECTING PRINTING PRESSES Filed Feb. 6,1922 5 Sheets-Sheet l 248 Fly. 23. 249

L. W. CLAYBOURN METHOD OF CORRECTING PRINTING PRESSES L. W. CLAYBOURNMETHOD OF CORRECTING PRINTING PREISSES Filed Feb. 6, 22 5 Sheets- SheetEN WwN QW L. W. CLAYBOURN METHOD OF CORRECTING PRINTING PRESSES FiledFeb. 6, 1922 5 Sheets-Sheet 4 Z ZZ/ 223 3 6 Fl 2 INVENTOR? L. W.CLAYBOURN METHOD'OF CORRECTING PRINTING PRESSES 5 Sheets$heet 5 FiledFeb. 6, 922

wHH 25 PATENT OFFICE.

LESLIE W. CLAYBOURN, OF MENASHA, WISCONSIN.

METHOD OF CORRECTING PRINTING IPBiESSES.

Application filed February 6, 1922. Serial No. 534,348.

To all whom it may concern:

Be it known that I, LESLIE W. CLAY- BOURN, a citizen of the UnitedStates, residing in the city of Menasha, in the county of Winnebago andState of Wisconsin, have invented certain new and useful Improvements inMethods of Correcting Printing Presses, of which the following is aspecification.

My invention relates particularly to method of correcting the printingcouples of printing presses comprising either a reciprocating bed or arotating cylinder, or both such bed and cylinder.

I have exemplified my invention as applied to a printing press employingreciprocating type-beds and rotating tympan cylinders coacting with thebeds in a so-called two-revolution two-color printing press, although itwill be obvious that my'invention is employable in other relations.

I have found that best printing results are obtained when the peripheryof the cylinder represents a true cylindrical surface concentric withits axis of rotation and the type-supporting surface of thereciprocating bed is in a true plane parallel with the axis of rotationof the cylinder, and it is the object of my invention to obtain thisdesirable condition.

It has heretofore been a practice to separately operate upon theguideways of the frame for the bed, upon the guideways at the underfaeeof the bed, the intermediate anti-friction mechanism therefor, and thetype-surface of the bed, as well as upon theperipheral surface of thecylinder and the journals and bearings therefor, and to thus attempt toobtain a parallel relation between the peripheral surface of thecylinder and the type-surface of the bed during the operation of theprinting press, with the result that variations incident to the separateoperations and incident to a lack of true relation in assembling, haveresulted, making a large amount of make-ready necessary for properprinting upon the press.

The printing pressures exerted by printing presses in printingoperations as heretofore usually conducted are very great, causingadditional variations between the peripheral surfaces of the cylinderand the type-surface of the reciprocating bed, due to displacement ofthe metal in the parts, and additional variations are in course of timecreated in the printing press by the wearing action of the printingpressures between the tympan cylinder or cylinders and the typebed orbeds.

In practice the bed reeiprocates upon antifriction devices, such asrollers or so-called sl ders, embracing a slider-frame and antifrictionrollers therein, and in practice the greater portions of the printingpressures due to the make-ready and also the greater amount of printingtakes place at or adjacent to the middle of the bed, resulting in courseof time in a depression of the middle portion of the bed and adepression of the middle portion in the length of the cylinder, so thatwhatever cylindrical form the cylinder initially had, and whatever planesurface the type-bed initially had, are lost and the surfaces distorted,the result being a hollow bed or beds and a cylinder of less diameter atits middle portion than at its end portions. 1

Under the general designation type I include separable type, lines oftype, plates, blocks and other printing surface supporting means. In atwo-cylinder printing press, such as exemplified, there isatype-bed foreach cylinder, instanced however as connected for combined movements.

It is the object of my invention to correct such undesirable conditionsdue to methods of building and assembling printing presses heretofore inuse and due to the wear hereinbefore described.

It is the object of my invention further to provide a new and improvedmethod whereby to produce supporting surfaces for the type and tympansheets, which shall be equidistant throughout their printing moments,measured by printing pressures, so as to obtain equal printing pressuresupon the printing surfaces throughout their areas and whereby furtherideal printing conditions are produced for employment of the printingplates shown, described and claimed in my copending application forpatent on 1111- provements in method of correcting printing plates andprinting plates produced thereby, Serial No. 453,665, filed March 19,1921, and, further, as one of the steps in my improved system ofprinting.

For accomplishing such object. I have conceived the method of finishingthe type-sup porting surface of the type or plate-supporting member ofthe printing couple, in-

stanced as the type-bed, and the peripheral surface of the cylinder,after the printing press has been assembled and is operable for printingpurposes, so as ;to correct said members in their operative relations toeach other, and further, to correct printing presses which have been inoperation and in which improper relation between the typedenudedsupporting surfaces during movements of said members similar to theirprinting movements, or in substantially their printing relations, thoughnot necessarily at printing distance from one another or at printingspeeds or printingdirections;

' further, to provide novel means for accomplishing said purposes;further, to employ the operating devices for said bed and cyl1nder inthe truing operations. The terms printing relation and operativerelation where they occur in the description and claims herein mean suchrelation as to result in movements of the respectivemembers of theprinting couple similar to their respective movements in performingtheir printing functions though not necessarily in printing proximity orat printing speeds or in printing directions. The speeds and directionsof movement of the respective members of the printing couple duringcorrection thereof by my method are desirably such surface speeds anddirections as are adapted for the tools and the positions of the toolsemployed in correcting. The invention will be further readily understoodfrom the following description and claims, and from the drawings, inwhich latter:

Fig. 1 represents a diagrammatic longitudinal section of a printingpress, showing the inaccuracies in magnified form due to wear, forthepurpose of illustrating defects corrected by my invention.

Fig. 2 is a diagrammatic representation of a cross-section of the same,showing such defects in magnified form for similar purposes.

Fig. 3 represents a side elevation of so much of a two-revolutiontwo-color printing press as is necessary to illustrate my invention, andhaving my improved apparatus applied thereto.

Fig. 4 is a reverse side elevation of the same.

Fig. 5 is a plan view of the same.

Fig. 6 is an end elevation of the same.

Fig 7 is a cross-section of the same, taken on the line 77 of Fig. 5.

Fig. 8 is an enlarged central vertical longitudinal section, showing oneof the Fig. 13 is a plan view, showing the feeding means for thecross-slide, partlybroken awa Fig. 14 is a detail in side elevation,showing the means for intermittently rotating the fountain roller.

Fig. 15 is a cross-section of the same, taken on the line 15-15 of Fig.14;

Fig. 16 is a side elevation of a detail of the operating means at thefountain roller to transmit motion to the cross-feed screw.

Fig. 17 is an inside elevation of the same.

Fig. 18 is a cross-section of the same, takenon the line 1818 of Fi 16.

Fig. 19 is a side elevation o the feeding means at the cross-feed screw.

Fig. 20 is a central vertical longitudinal section, taken on a linecorresponding to the line 88 of Fig. 5, but showing the correcting toolas an emery wheel and applied to the cylinder.

Fig. 21 is a similar cross-section, showing the correcting deviceapplied to the table.

Fig. 22 is a plan view of the same, partly broken away.

Fig. 23 is .a rear elevation of the same, partly broken away, and,

Fig. 24 is a plan view of the positioning gauge for the correctingdevice.

I do not herein claim means or apparatus which may if desired, beemplyoed in performing my improved method, or the means or apparatusherein shown and ion described, having shown, described and claimed thesame in a copending application, divisional hereof, for apparatus forcorrecting printing presses, filed in the United States Patent OfliceDecember 17, 1923, as Serial No. 681,237, to which reference is made fora more full exposition of said means and apparatus and the claims.

thereto.

My invention is shown applied to a tworevolution two-color fiat-bedprinting press,

Each of the beds is provided with side bearers 25.

The printing press has a usual main frame, comprising side frames 31,and crossgirts 32, 33, which have tracks 35, 36, 37, 38, thereon,extending longitudinally of the frame, the cross-girts comprisinguprights 39 on-which the tracks 37, 38, are supported.

Anti-friction devices are located between the type-beds and the tracks,exemplified as sliders, each of which comprises a framework 41, andanti-friction rollers 42, which roll on the tracks. Tracks 45, 46, 4748, on the under surface of the bed, ride on the rollers of the sliders.

The tympan cylinders are provided with trunnions 51, 52, journaled inbearings 53, 54, eccentrically journaled in bearing-blocks 55, 56,respectively adjustable by adjusting screws 57, 58, and 59, 60, inguideways 61, 62, in standards 63, 64, of the frame, suitable meansbeing provided for raising the impression cylinders into off-impressionrelation or causing their descent into on-impression relation to thebeds at alternate revolutions of the cylinders or as desired, in theusual operation of the printing press, accomplished for instance bymeans of links 66, 67, articulated with arms 68, 69, extending from andrigid with the eccentric bearings. The lower ends of the links areoperated by usual 21111 and lever mechanism having operative connectionswith usual cam-disks 71, 72, suitably rotated in the usual operation ofthe printing press.

Each of the tympan cylinders comprises side bearers 73, which coact withthe side bearers 25 on the beds. The usual tyinpan sheets and coveringare received over the peripheral surface of the cylinder in the recessbetween the side bearers thereon, and the type are received on thesupporting surface of the bed between the side bearers thereon. Thecontact faces of the side bearers which coact with each other areintended to be in the plane of the printing surfaces of the type at theprinting moment.

A transfer cylinder 7 6 is located between the tympan cylinders and maybe of usual construction.

The sheets to be printed are arranged to be fed to the first tympancylinder 23 from a feed-board 78, the sheet being arranged to be grippedby suitable grippers on the cylinder and carried around the cylinder inthe direction of the arrow a for the purpose of being printed, in theusual manner, the bed 21 of the first printing couple moving in thedirection of the arrow b in this printing operation.

After being printed by the first printing couple, the sheet travels withthe cylinder 23 in its rotation until the advanced edge of the printedsheet arrives at the transfer cylinder 76, when it is released by thegrippers of the tympan cylinder 23, and grip ed by the grippers of thetransfer cylin or 76, and carried in usual. manner with the transfercylinder in the direction of itsrotation, the direction of whichisindicated by the arrow 0, to the tympan cylinder 24, of the secondprinting couple.

Upon arrival of the advancing edge of the sheet at the tympan cylinder24, the said advancing edge is released by the grippers of the transfercylinder and grasped by the grippers of the second tympan cylinder, andthen carried about the second tympan cylinder in the direction of itsrotation, indicated by the arrow d, the sheet being printed by theprinting surfaces on the bed 22, when the sheet arrives between thetympan cylinder 24 and the bed 22, the bed of the second printing couplemoving in the direction of. the arrow e during the printingoperation.

The sheet is then carricd with the tympan cylinder 24 until it arrivesat the delivery mechanism, the stands of which are indicated at 81,where it is transferredto the delivery mechanism for delivery of thesheet.

The structures of these parts and their operations may be of any usual61- ordinary kind. The grippers are not shown, as the same have beenremoved for the purpose of having my improved apparatus operate upon thetympan cylinders. It will be understood that only so much of theprinting press is shown as is concerned with the performance of myimproved method thereon.

In the usual printing operation of the printing press the printingsurfaces supported by the bed-sections are suitably inked by suitableform rollers, suitably placed, and supplied with ink in any ordinary orwell-known manner, for instance, from usual ink tablets, not shown, butnormally secured to the outer ends of the beds, supplied with ink bycoaction with suitable ink distributing and ink supplying rollers, theinitial ones of which are shown respectively as fountain rollers 85, 86,at the respective ends of the press, to which intermittent motions areimparted by any ordinary or wellknown means.

I have exemplified the means for rotating the cylinders, forreciprocating the bed-sections, and for intermittently rotatingthefountain ink rollers as follows: A driving shaft is exemplified at 91,and is arranged to have suitable driving means, exemplified as a tightpulley 92 and a loose pulley 93, over which a suitable belt from asuitable source of power is arranged to be selectively received.

A gear 94 is fixed on the driving shaft and meshes with a gear 95, fixedon a shaft 96, journaled in the frame. The gear 95 meshes with a gear97, journaled on a stud 98 fixed to the frame. Thegear 97 meshes with agear 99 fixed to one of the trunnions of the tympan cylinder 24. Thegear 99 meshes with gear 101 fixed to a shaft 102' of "means of a pinion108 which rotates with the shaft 96, but has spline-connectiontherewith, and arranged to be alternately brought into mesh, by axialshifting thereof on its shaft by any Well-known mechanism, with racks109-, 110, extending lengthwise of the bed-structure, on which bothbed-sections are located, and supported respectivelyby the bed-structureand by a hanger 111 depending from the bed-structure, for alternatelydriving the bed-structure in reverse directions.

Intermittent rotation is shown imparted to each of the fountain rollers.This may be accomplished by means of a link 116, one end of which hasarticulation with a crankpin 117 on one of the cam-disks 71, 72, whichare employed for 4 imparting the desired movements to the eccentrics forcontrolling the on-impression and off-impression relations of the tympancylinders. The other end of the link 116 has articulation with a lever119, journaled about the shaft 120 of the fountain roller; this shaftbeing journaled in bearings 121 of end frames 122 of the respective inkfountains 123, 124.

A ratchet-wheel 125 is fixed to this shaft. A pawl 126, pivoted to thelever 119, is urged towards said teeth by a sprin 127 engaging a pin 128on the pawl. en the link moves the lever in one direction, an idlemovement of the pawl with relation to the ratchet-wheel takes place, andwhen the lever is moved in the opposite direction, the pawl engages oneof the teeth of the ratchetwheel for partially rotating the fountainroller. A spring detent 129 is arranged to engage notches 130 in a disk131, fixed to the shaft of the fountain roller, for holding the fountainroller in actuated relations.

In order to control the degrees of movements of the fountain roller, acover-cam 134 is provided, having a cover-periphery 135 extendingoutwardly beyond the ratchetteeth to cause the pawl to ride thereon whenthe cover-portion is in the range of the pawl. The cover-cam isadjustable about the shaft of the inking roller, and is arranged to'beheld in adjusted positions by means of a clamp-screw 136, received in anarcuate slot 137 in a tail-piece 138 of the cover-cam, and arranged toclamp the tail-piece to one of the end-frames of the inking fountain forholding the cover-cam in adjusted positions,

to determine the number vof teeth of the ratchet-Wheel which shall beexposed to the action of the pawl, and thereby determine the angulardistances of rotation of the inking roller at each rotation thereof.

The parts and operativedevices of the printing members hereinbeforespecifically described are such as are usual in printing presses of thischaracter, and the! same or. other usual devices usually employed intheir stead may be employed in carrying out my invention.

Referring toFigs. 1 and 2, representingdiagrammatically the inaccuraciesdescribed prevalent in printing presses, the type-supporting surface141of the type-bed is de-. 'nuded of its type including all printingsurface supporting elements, and the supportshown at 145. It is assumedthat such of the rollers 42 and the tracks therefor under the bed ashave become worn have been renewed by replacement, or refinishing, for

proper travel of the bed. Any such wear is greatest under the middleportion of the 4 bed. The middle portion of the type-bed in practicereceives the reatest printing pressures, as well as has die greatestamount of printing pressures exerted thereon, due to the fact that inpractice the printing forms, whether large or small, are usually locatedtoward-the middle portion of the type-bed. For similar reasons thetympan cylinder has depressions formed therein, represented as a hollow148 toward the middle of the tympan cylinder.- I

These deformities are accentuated in Figs. 1 and 2, from what they arein actual practice, in order to clearly show the defects which arecorrected by my-invention, other defects being variationsjdue totheseparate finishing of coacting surfaces and operating and supportingparts in the making of printing presses as heretofore usually.constructed;

I shall now describe a mechanism which my method, although othermechanism or manipulation may be utilized in performing v the same. Thismechanism is exemplified as employed in correcting the type-supportingsurface of the bed, and the peripheral surface of the tympan cylinderu Ihave in Fi 3, 4 and 5 (see also Figs. 8 and 9), exemp 'fied one of theseapparatuses with its finishing tool presented toward the bed of one ofthe 4 printing couples at one end of the printing press, and another ofthe apparatuses with its finishing tool presented toward the cylinder ofthe other of the printing couples at the other end of the printingpress. \Vhen correcting the printing press, I prefer to remore thoseportions thereof which might be in the way of the finishing operationsand are not concerned therein. including the distributing rollers andthe form rollers of the inking mechanism and the stands therefor.

I prefer to provide the correcting apparatus with supports arranged tobe attached to the frame of the printing press and support ing aguideway for the finishing tool in such manner that the finishing toolmay be presented to the bed or to the cylinder without disturbance ofthe supports so that when the supports have been secured to the frame insuch manner that the feeding motion of the finishing tool is parallelwith the axis of rotation to the cylinder, such setting may be employedfor finishing both members of the printing couple, instanced as thecylinder and the bed.

Thus I employ a pair of supports 151 arranged to be. secured to the sideframes of the main frame ofthe printing press, for instance, by means ofbolts 152 received through slots 153 in the supports and threaded intothreaded holes in the side frames, which may be the threaded holes usedto connect the bearings for the form rollers to the side frames.

A cross-rail 155 is supported on the supports. preferably in such manneras to permit the cross-rail to be angularly adjusted on the supports forpresenting the tool thereon either to the bed or to the cylinder. Forthis purpose I provide the supports with grooves 156 in which tongues157, 158, on the cross-rail are arranged to be received, for positioningthe cross-rail definitely with relation to the supports.

A cross-slide 161 is fed lengthwise of the cross-rail, that is,transversely of the printing press, being guided in such travels byguides 162, and 163, on the cross-rail coacting with guideways 164, 165,in the crossslide. The guide 162 and its complemental guideway are shownas square and the guide 163 and its complemental guideway are shown astapering, comprising a takeup gib 166. acted upon by take-up screws 167for adjusting the sliding contact in the guides and guideways, jamb-nuts168 fixing the adjusting screws ,in adjusted positions.

Feeding movement is imparted to the cross-slide by means of a cross-feedscrew 171 of fine pitch having threaded connection with a nut 172secured to the cross-slide. A ratchet-wheel 173 is fixed to thecrossfeed screw. The feed screw is journaled at its respective ends inbearings'174, in the cross-rail.

A rockable lever 176 is journaledv about the feed-screw, and has a pawl177 pivoted lever by an articulation 181, and has a-reci )rocatinmovement im arted thereto by a reciprocating part of the printing press,

instanced as the lever 119, which imparts .intermittent rotary motion tothe fountain roller. This connection is preferably an adjustableconnection for adjusting the distances of steps of feed of thecross-slide, in addition to the adjustment heretofore described foradjusting the extents of rotative movements of the fountain roller.

In order to accomplish this, I provide an arm 182, having operativeconnection in manner hereinafter described, with the shaft 120 of thefountain roller, to impart intermittent rotary movements to thecross-feed screw 171. This arm is provided with a slot 184. The link 180is received through an eye 185, arranged to ,be clamped in ad ustedpositions lengthwise of the link by means of a set-bolt 186. The eye isswivelingly mounted by a swivel 187, at the head end of a bolt 188,received through the slot 184, a clamp-nut 189 clamping the bolt inadjusted positions lengthwise of the slot 184.

When now the printing press is placed in operation for operating theparts remaining therein and concerned in the correction of the printingpress, reciprocating motion is imparted to the lever 119 by means of thecrank-pin 117 and link 116, which reciproca-ting motion is in turnimparted as an intermittent rotary motion by the arm 182 to thetool-feeding mechanism.

A tool-slide 191. is adjustable transversely of the cross-slide in aguideway 192 by means of an adjusting screw 193 journaled in a lug 194in the tool-slide, in which the adjusting screw is held endwise, andhaving threaded engagement with the cross-slide. This adjusting screwpreferablyv has a fine .pitch for minute adjustment of the finishingtool toward and from the surface being finished, the degrees ofadjustment being determined by means of the graduations of an index 195.

I preferably employ a clapper-box 197, pivoted to the tool-slide at 198,in which to mount the finishing tool, exemplified at 199, by means of atool-post 200, having a clampbolt 201, by means of which to fasten thefinishing tool to the clapper-box. This finishing tool is exemplified asa scraping tool, to provide the metal of the supporting surfaces of-thebed and cylinder with a smooth surface.

In employing my improved method for correcting printing presses, I firstreplace any worn rollers and tracks therefor there may be under thetype-bed, or correct the same, for providing a proper foundation for thetravel of the bed. I then adjust the tympan cylinder in true horizontalrelation or as parallel to the horizontal relation of the bed underprinting pressures as possible, although adjustment to printing distanceis not necessary. I mount the supports 151 on the side frames and insertthe bolts 152 and thread the same into said side frames. These supportsare so adjusted as to cause the grooves 156 therein to be parallel withthe axis of rotation of the cylinder, so that the feeding movement ofthe cross-slide on the cross-rail supported by the supports shall beparallel to such axis of rotation in order that the periphery of thecylinder may be finished as a true cylinder having the axis of rotationcoincident with its axis.

The positioning for parallelism of the cross-rail may be obtained, forinstance, by a suitable gauge 205, having a pointer 206 received in thecenter mark of one of the trunni'ons of the cylinder, and having anotherpointer 207, adjustable thereon, by means of'being mounted in a slot208, and clamped in adjusted positions by means of a nut 209 receivedover a threaded shank 210 in said slot and having a shoulder 211, thebody of the gauge being clamped in adjusted positions between the nutand the shoulder. The pointer 207 is caused to be received in the centermark in the end of the feed-screw.

The pointers being adjusted to the desired distance, and the cross-railand its supports having received a. preliminary fastening for placingthe cross-rail in proximate parallelism to the axis of rotation of thecylinder, the definite adjustment of the cross-rail may be accomplishedby employment of the gauge, held perpendicular to the axis of rotationto the cylinder, and causing the punch marks in the respective ends ofthe feed-screw to register with the pointer 207 of the gauge, While thepointer 206 thereof is held in the center punch mark of the trunnion atthe same side of the press. The operation is repeated at opposite sidesof the press, and the adjustments continued until the desired result isobtained.

A definite positioning of the supports may be had by tapping upon thesame in order to shift the support on the side frame for causing properpositioning of the support with relation to the cylinder determined bythe gauge in the manner described. The clamp-bolts may then be fastenedand the parallelism again tested by means of the gauge. Similaroperations may be performed at each end of the cross-rail.

The cross-rail is secured to each of the supports by means ofclamp-bolts 214 received through apertures 215 in the top wall 216 ofthe support and threaded into the cross-rail.

When the supports have been positioned and clamped in place, they arenot again disturbed until the finishing operations upon the pair ofmembers of the printing couple, i'nstanced as the bed and the cylindercoae'ting therewith, have been completed. The cross-rail is merelyturned upon the supports for presenting the tool thereon either to thebed or to they cylinder. This turning of the cross-rail is shownaccomplished in Figs. 3,

4, 8 and 9, by means of causing the tongues- 157, 158, to selectivelyregister with the grooves 156. These tongues and the grooves. beingparallel with each other, position the cross-rail for parallelism ofcross-feeding movement of the tool, whether presented to the bed or tothe cylinder. This construction further forms a rigid construction inwhich the cutting function of the tool is resisted by substantial meansadjacent to the cutting edge of the tool and constructed in such manneras to avoid yield and chatter. The cross-rail is represented as a heavycored casting.

The clapper-box for supporting the tool is especially useful whenfinishing the bed for permitting the cutting edge of the tool to retreatupon retracting movement of the bed and causing the tool to return tocutting position upon advancingmovement of the bed during the cuttingoperation. In order to provide for the guideway adjacent to the toolbetween the cross-rail and the crossslide, I prefer to mount the tongues158 on end-walls 217 extending from the body of the cross-rail.

When the truing mechanism is transferred from one printing couple to theother, it is reversed end to end.

I have found it desirable to remove the chips and refuse caused by thecutting tool as soon as formed, in order to keep the surface beingfinished clear of chips and refuse, especially when employing thepressure devices hereinafter described. For this purpose I prefer toemploy a powerful s'uction device. comprising a mouth 221 ad jacent tothe tool. The mouth communicates with a channel 222, in an arm 223,secured at 224 to the tool-slide and having connection with a suitablesuction device to create a powerful suction in said passage.

As hereinbefore stated. it is one of the objects of my invention to truethe bed in its printing relation. that is, while in reciproeatingrelation in the printing press, and to true it in such manner that thesurface relation between the type-supporting surface of the bed and theperipheral surface of the cylinder shall be a parallel relation,parallel with the axis of rotation of the cylinder. when said surfacesare subjected to printing pressures. If it is desired to exertadditional pressure upon the bed to additionally hold the bed downfirmly upon its rollers or supports or to exert substantial printingpressure relation upon the bod lots 226, 227,'in the supports and arethreaded into suitable threaded holes in the side frames, for adjustablyfixing the supports to the side frames. These threaded holes may be theones usuall employed for attaching the inking roller earings to the sideframes. Rollers 232 are provided with trunnions 233, journaled inbearings 234 of forks .235, there being a suitable number of theserollers arranged cross-wise of the bed for exerting pressure throughoutthe width of the bed.

Each of the forks is mounted on a lunger 236, movable axially in abearing 23 of the cross-rail 228, and prevented from turning therein bybeing provided with a key 238, received in a slot 239 in the bearing.stem 241 extends from the plunger and has a heavy helical spring 242received thereabout within the bearing 237. A sleeve-nut 243 hasthreaded connection with the 'upper end of the bearing 237, the stems241 being reciprocable in the sleeve-nut.

The hold-down device is instanced as independent of and as having noconnection with the truing device, so that no vibrations of the pressurehold-down device may be communicated to the truing device.

While I have in Figs. 5, 8 and 9 exemplified a metal scraping tool orfinishing tool, having a scraping or finishing edge, as the finishingtool of referred form, it is obvious that other finishing tools may beemployed, and that, for instance, a grinding wheel may be employed forfinishing purposes.

I have shown such grinding wheel in Figs. 20 to 23, as used in place ofthe scraping tool, the other parts of the mechanism being substantiallythe same and indicated by similar reference numerals with the exponentprime. Thus I mount a grinding Wheel 248 on a shaft 249 journaled inbearings 250 of a tool-slide 191. These bearings may be partof anelectric motor frame and the rotation of the grinding wheel accomplishedby an electric motor 251, of which the shaft 249 may be thearmature-shaft. This grinding may be accomplished either wet or dry, asmay be desired, suitable means being provided for preventing access ofthe grinding refuse into working parts of the press, and the refuseremoved by suction device similar to the suction device when employingthe finishing tool.

The beds and cylinders are, during the truing'operations, preferablyoperated by the means employed for operating the same in their printingfunctions. The cylinder 23 is shown rotating in the direction of thearrow a during its printing function. When rotating this cylinder duringthe truing operation thereon, it is preferably rotated in oppositedirection.

The entire widths of-the supporting surfaces of the tympan and type-bedare preferabl y trued by employment of my improved method. lVhen truingthe bed it is preferablethat the inking table thereof he re moved, thepressure rollers bearing upon the supporting surface and the surfaceunder the inking table during the truing operation. lVhen truing thebed, its side bearers may also be removed.

' The bearers of the cylinder and bed are reduced or correctedpreferably while respectively on the cylinder and bed, to conform to thereductions or corrections made upon the cylinder and bed respectively.The reductions or corrections of the bearers are made by the samecorrecting devices used in correcting the denuded supporting surfaces ofthe bed and cylinder while still at tached to the frame of the printingpress, and while the bed and cylinder are respectively moved insubstantial printing relation preferably by the operating parts of theprinting press. The correction of the bearers of the bed may take placewhile the bed is held under substantial printing pressure. The operativeconnection between the shaft 120 of the fountain roller and the arm 182,for imparting an intermittent motion to the arm 182, may be accomplishedas follows, referring to Figs. 13, 16, 17, 18 and 19.

The arm 182 has a bearing 254. about the shaft 120, and is held to saidshaft by a collar 255, fixed to the shaft by a set-screw 256. Aratchet-wheel 257 is fixed to said shaft by a set-screw 258. A pawl 261is pivoted to the arm on a pin 262 and is provided with a heel 263 and atripper-pin 264. The and is arranged to the brought into engagement withone of the teeth of the ratchet-wheel for movement of the arm 182 inoperating direction, and is arranged to be moved out of engagement withsaid tooth at the completion of its operative movement, the arm beingarranged to be automatically returned to initial position to be againengaged by a tooth of the ratchet-wheel at the next intermittent rotarymovement of the shaft 120. The extent of this intermittent rotarymovement of the shaft 120 is adjustable by means of the cover-cam 134 inmanner hereinbefore described. Means are therefore provided tocorrespond the engaging and disengaging moments of the pawl 261 with theratchet-wheel 257, with the angular dis tance of intermittent rotarymotion of said shaft 120. Thus I provide a tripper-cam 266, instanced ason a elan'ip-block 267, this clampblockbeing of inverted U-form forbeing received about the end-wall 122 of the ink reservoir, and clampedin ad'usted positions to said end-wall by means 0 a thumb-screw 268. Theadjustment moves the tripper-cam 266 toward and from the vertical planein which the shaft 120 is located in order to be engaged by thetripper-pin 264 on the pawl and thereby determine the moment ofdisengagement of the pawl from said ratchet-wheel. A spring 269 issecured to the arm 182 and is provided with a hump 270 to co operatewith the heel 263 of the pawl to hold the pawl in engaged or disengagedrelation.

A tripper -part 273 is provided with a tripper-face 274 to engage thetripper-pin in order to re-engage said pawl with said ratchet-wheel.This tripper-part is on a shank 275, provided with a slot 276, throughwhich a set-screw 277 is received, the setscrew being threaded in one ofthe walls of the inverted U-clamp 267, for adjusting the tripper-face274 toward and from the vertical lane in which the shaft 120 is located.l vhen the tripper-pin 264 strikes the tripper-face 274, the heel 263 ofthe pawl is moved to the other side of the hump 270 on the spring 269,for holding the pawl in engaging relation with one of the teeth of theratchet-wheel. The dotted position of this pawl shown in Fig. 17 showsits position just prior to its tripped relation for engaging the pawl.

Referring to Fig. 17, the intermittent rotary movements of the shaft 120take place in the direction of the arrow 7 for moving the arm 182 inoperative direction as shown by said arrow. whereby an intermittentrotary motion is imparted to the cross-feed screw 171 in feedingdirection.

At the end of this operative movement, de termined by the adjustment ofthe cover-cam 134, the tripper-pin 264 engages the trippercam 266 fordisengaging the pawl from the ratchet-wheel, although if desired, thisengaging moment may take place prior to the end of intermittent movementof the ratchet-wheel in operating direction, thereby providingadditional ad ustment of rotary movements of the arm-182, and consequentadjustments of the lengths of steps of feed of the cross-feed screw.

When the pawl has been disengaged from the ratchet-wheel, the arm 182'isautomatically returned to initial position, shown accomplished by meansof a sprin 280 having one end 281 received in a suite. le aperture inthe link 180, and its other end 282 received in a suitable aperture inthe clamp-- block 267, an intermediate coiled portion 283 of the springbeing received and positioned loosely about a bolt 284 fixed in saidclamp.

Near the end of such return movement of the arm 182, the tripper-pin 264strikes the trip er-cam 274 for again engaging said paw with a tooth ofthe ratchet-wheel, preparatory to the next intermittent operativemovement of the link 180. The springs cushion the return movements ofthe arm.

This cross feed screw is provided with attaching means for attaching ahand-crank for operating the cross feed screw by hand and positioningthe cross-slide thereon in any desired position. This attaching means isshown as a square end 286 on said crossfeed crew.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is:

1. The method of correcting printing couples, which consists in reducmgthe denuded supporting surface of a member thereof while being operatedin substantial printing relation to its mating member.

2. The method of correcting printing couples, which consists in reducingthe denuded supporting surface of a member thereof while being operatedin substantial printing relation to its mating member and undersubstantial printing pressure.

3. The method of correcting the supporting surface of a member of aprinting couple comprising a rotatable member, which consists inoperating said member the supporting surface of which is being correctedin substantial printing relation, and reducing said supporting surfaceinto parallelism with the axis of rotation of said rotatable memberwhile being so operated.

4. The method of correcting the denuded supporting surface of a memberof a printing couple comprising a rotatable member, which consists inoperating said member the supporting surface of which is being correctedin substantial printing relation, reducing said denuded supportingsurface into parallelism with the axis of rotation of said rotatablemember being so operated, and correcting the bearers of said memberbeing corrected to correspond to such correction.

5. The method of correcting the support:- ing surface of a member of aprinting couple comprising a rotatable member which consists inoperating said member the supporting surface of which is being correctedin substantial printing relation, and while so operating reducing saidsupporting surface into parallelism with the axis of rotation of saidrotatable member while held under substantial printing pressure.

6. The method of correcting a printing couple which consists in reducingall portions of the denuded supporting surfaces thereof into parallelismwhile operating in substantial printing relation.

7. The method of correcting a printing couple which consists in reducingall portions of the denuded supporting surfaces thereof into parallelismwhile operating in substantial printing relation, the denuded supportingsurface of one of the members of said couples being so reduced whilesaid member 1s held under substantial printing pressure.

8. The method of correcting a printing couple which consists in reducingall portions of the denuded supporting surfaces thereof into parallelismwhile operating in substantial printing relation, the denuded supportingsurface of one of the members of said couples being so reduced whilesaid member is held under substantial printing pressure, and correctingthe bearers of said members to correspond to said corrections.

9. The method of correcting a printing couple comprising a rotatablemember, which consists in mounting and operating said printing couple insubstantial printingrelation in its printing press, and reducing itsdenuded supporting surfaces into parallelism with the axis of rotationof said rotatable member while so operating.

10. The method of correcting the denuded supporting surface of a memberof a printing couple of a printing press comprising a rotatable member,which consists in operating said member the supporting surface of whichis being corrected in substantial printin relation, and while being sooperated re ucing said denuded supporting surface into parallelism withthe axis of rotation of said rotatable member, and controlling saidreducing'by a usual operating part of said' rotation of said cylinderand reducing the printing press.

11. The method of correcting the supporting surface of a reciprocatingbed of a printing press which consists in reciprocatin said bed in saidrinting press in usua printing relation and dressing said supportingsurface of said bed into a plane surface while so reciprocating.

12. The method of correcting the supporting surface of a reciprocatingbedof a printing press which consists in reciprocating said bed in saidprinting press in usual 5 printing relation while holding said bed undersubstantial printing pressure and dressing said supporting surface ofsaid bed into cation and whi controlling said reducing by saidadditional element.

14. The method of correcting a printing press comprising a printingcouple including a. reciprocating bed, which consists in operating saidprinting press so as to cause substantial usual printing movements ofsaid printing couple and an additional element, reducing thetype-supporting surface of said reciprocating bed into a plane surfaceby coaction of a dressing tool with said type-supportin surface duringits reciprofia said bed is held under pressure, and controlling saidreducing by said additional element.

15. The method of correcting a printing ress comprising a printingcouple including a rotatable cylinder and a reciprocating bed and eachof the members of which is provided with bearers, which consists inoperating said printing press so as to cause substantial usual printingmovements of said printing couple, reducing the denudedtympan-supporting surface of said cylinder to cylindrical form parallelwith the axis of type-supporting surface of said reciprocating bed intoa plane surface parallel with said axis of rotation by coaction of adressing tool with said respective surfaces during said rotation andreciprocation respectively, and correcting said bearers to correspond tosaid reductions of said respective surfaces.

In testimony whereof, I have hereunto subscribed my name in the presenceof two subscribing witnesses.

LESLIE W. CLAYBOURN. In presence of DELMA Wnmrsmo, FRANK K. BOWMAN.

